The S428TS D-Bowl topmount sink is made from a granite composite material that is comprised of 80% Quartzite and 20% Acrylic. Silver ions are added to the sink during the manufacturing process that kill 99% of bacteria on contact. Aside from being anti-bacterial, the S428TS is stain and scratch resistant and can resist heat up to 550 degrees. The overall dimensions of the sink are 25" x 22" x 8 1/4" and a 27" minimum cabinet size is required. The sink contains a 3 1/2" offset drain and is available in multiple colors. As always, our Composite Granite sinks are covered under a limited lifetime warranty for as long as you own the sink.